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hw to measure voltage and current

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rajsundar08

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In my project i have to measure voltage and current of about in the range of (0-50)V
and (0-10)A using i PIC microcontroller.. what are the external components can i use for to reduce the voltage and current so that i give it as input PIC microcontroller..


plz reply

thanx in advance
 

Here is a simple voltmeter circuit based on a PIC:
http://www.best-microcontroller-projects.com/lcd-volt-meter.html
It takes 0-5V, so the input of 50V has to be divided ..
The simples thing to do is to use a resistive voltage divider ..
Here is an example (select 47kΩ as R1 and 5.1kΩ as R2):
http://www.pbpgroup.com/modules/wfsection/article.php?articleid=25
Measuring current of 10A is a little bit more tricky, as if you used only a shunt resistor to produce 5V voltage drop (full PIC's input range) you'd need a resistor of ≈0.5Ω rated for 50W ..
So, rather than a smaller shut and an opamp, how about Hall effect sensor?
Here is an example:
http://www.siliconchip.com.au/cms/A_30551/article.html

Rgds,
IanP
 

Hi,

To Measure voltage :-
Just drop the voltage by using step down transformer. After that check whether isolation is needed. If yes than use Opto coupler for Isolation.

To measure current :-
For Current there is three different technology
1. With Sense Resistor
2. Current Transformer
3. Hall Effect Sensor.
Use any one & after that use OpAmp for amplification. Opamp convert Higher current to Voltage format Here u need to set the resistor values based on ur sensing voltage requirement (0v - 5v).

I think it will be helpful.

Regards,
Chanchal Chauhan
 

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